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Structural Investigation of the Surface of Bioglass 45S5 Enriched with Calcium Ions
Author(s) -
Lopes João H.,
Mazali Italo Odone,
Landers Richard,
Bertran Celso A.
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12305
Subject(s) - x ray photoelectron spectroscopy , biomaterial , calcium , chemical engineering , depolymerization , bioactive glass , materials science , phosphate , phase (matter) , ion , simulated body fluid , chemistry , mineralogy , composite material , nanotechnology , scanning electron microscope , polymer chemistry , metallurgy , organic chemistry , engineering
In this article the changes on the surface of the 45S5 bioglass submitted to an enrichment with calcium ions were investigated. The method employed was the immersion of bioglass in calcium molten salt bath at 450°C. Changes in composition were probed by different techniques of chemical analysis. The use of SEM ‐ EDS allowed estimating the thickness modified, as being about 10 μm. X ‐ray photoelectron spectroscopy enabled to infer over the structural changes on the surface of 45S5 bioactive glass. The entry of calcium in the vitreous network promoted the phase separation of microdomains rich in silica and phosphate on the surface of the glass. The formation of immiscibility region was attributed a depolymerization of silica network and also, to a possible migration of phosphate species from the bulk. The results of this study indicate a great change in the surface properties of this biomaterial. In addition, the method proposed in this study proved to be very promising in the possibility of designing the surface of bioactive glasses, to modulate the desired properties, keeping the bulk unchanged.